User Guide

Canvas 12 User Guide
Original RGB image Posterize 8 levels
Posterize 4 levels Posterize 2 levels
The Posterize command’s effect depends on the mode of the image you posterize; e.g., if you apply
the Posterize command with a setting of 2 levels to a grayscale-mode image, the image becomes
black and white. If you apply the same setting to an RGB-mode image (even if it contains only grays),
the command converts each pixel’s red, green, and blue value to either zero or full color, reducing
the image to eight colors — red, green, blue, red-green, red-blue, blue-green, black, and white.
You can’t use the Posterize command on images in Black & White or Indexed mode.
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